Plasmodium

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plasmodium,

name for a stage in the life cycle of a slime moldslime mold
or slime fungus,
a heterotrophic organism once regarded as a fungus but later classified with the Protista. In a recent system of classification based on analysis of nucleic acid (genetic material) sequences, slime molds have been classified in a major group
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. Also, Plasmodium is the name given to the genus of the protozoan parasite that causes malariamalaria,
infectious parasitic disease that can be either acute or chronic and is frequently recurrent. Malaria is common in Africa, Central and South America, the Mediterranean countries, Asia, and many of the Pacific islands.
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.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Plasmodium

 

a colorless or brightly colored vegetative body of myxomycetes that consists of multinucleate protoplasm lacking a membrane. It varies in size from several sq mm to 1 sq m (sometimes 1.5 sq m). One distinguishes protoplasmodium, which consists of undifferentiated protoplasm (Echinostelium minutum); aphanoplasmodium, which consists of a network of undifferentiated strands of nongranular protoplasm (species of Stemonites); and phaneroplasmodium, which consists of well-differentiated protoplasm made up of strands and lobes with clearly visible granular contents (species of Physarum).

Internal movement of protoplasmic currents capable of changing the direction of their motion is characteristic of plasmodium. The motile mass feeds saprophytically, absorbing nutrient matter through its entire surface. It moves by means of protoplasmic processes known as pseudopodia. Plasmodium lives in the dark under tree bark, inside rotten and damp wood, and under fallen leaves. At the time of spore formation, it moves onto the surface of a substrate and is transformed into a spore-bearing organ, which varies in shape and coloration in different species. In plasmodiophoraceous myxomycetes, the plasmodium parasitizes the tissues of algae, fungi, and higher plants. It causes diseases in higher plants, such as clubroot of cabbage and other crucifers.

V. A. MEL’NIK


Plasmodium

 

a genus of parasitic protozoans of the order Hemosporidia. More than 60 species parasitize vertebrates, including man, and cause malaria. The carriers of plasmodia are insects, mainly mosquitoes of the family Culicidae. Plasmodia, in the form of spindle-shaped sporozoites, enter the vertebrate along with saliva from the mosquito and embed themselves in the endothelium of the blood vessels or in liver cells. The protozoans reproduce asexually (schizogony), giving rise to numerous tiny mononuclear cells, or merozoites. The merozoites either asexually reproduce in the tissue or enter the blood and penetrate the red blood cells. They undergo a series of schizogonies in the blood cells, as a result of which the number of parasites in the blood sharply increases. The release of the merozoites from the destroyed red blood cells is accompanied by entry into the plasma of harmful products of the parasite’s metabolism.

At a certain stage in the life cycle, some of the merozoites formed in the red blood cells, having become embedded in new red blood cells, are transformed into gametocytes. The female gametocytes, or macrogametocytes, are transformed into macrogametes in the body of the vertebrate; development of the male gametocytes, or microgametocytes, is possible only in the body of the mosquito. After the plasmodia enter the mosquito’s stomach along with the blood of the vertebrate, each microgametocyte gives rise to several flagelliform microgametes, which fuse in pairs with macrogametes, forming motile zygotes, or ookinetes. After penetrating the epithelium of the mosquito’s stomach, the ookinetes surround themselves with sturdy membranes under the stomach’s muscular layer and form oocysts. After repeated division of the nucleus of the oocyst, the contents break up into numerous (up to 10,000) tiny mononuclear sporozoites. The membrane of the oocyst ruptures, and the sporozoites emerge into the body cavity of the insect. Moving actively in the hemolymph, the sporozoites enter the salivary glands of the mosquito. When the insect sucks blood, they enter the body of the vertebrate.

Four species of Plasmodium parasitize humans: P. vivax (the causative agent of tertian malaria), P. malariae (quartan malaria), P. falciparum (falciparum malaria), and P. ovale (ovale malaria). Mosquitoes of the genus Anopheles are the carriers of these species of Plasmodium. Primates are parasitized by P. rei-chenowi and P. knowlesi; rodents by P. berghei; birds by P. relicturn, P. gallinaceum, P. durum, P. lophurum, and P. catemerium; reptiles by P. agamae and P. lacertiliae; and amphibians by P. bufonis and P. catesbiana.

O. I. CHIBTSOVA

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

plasmodium

[plaz′mō·dē·əm]
(microbiology)
The noncellular, multinucleate, jellylike, ameboid, assimilative stage of the Myxomycetes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Isolation of parasitized RBCs: Three adult female BALB /c mice with 10 weeks of age and 22 g of weight were infected with 5x103 parasitized red blood cells (RBCs) of Plasmodium berghei ANKA strain intraperitonially (IP).
Giday, "Evaluation of antimalarial activity of leaves of Acokanthera schimperi and Croton macrostachyus against Plasmodium berghei in Swiss albino mice," BMC Complementary and Alternative Medicine, vol.
de Carvalho Vilela et al., "Anxiety-like behavior and proinflammatory cytokine levels in the brain of C57BL/6 mice infected with Plasmodium berghei (strain ANKA)," Neuroscience Letters, vol.
Peters, "The value of drug-resistant strains of Plasmodium berghei in screening for blood schizontocidal activity," Annals of Tropical Medicine and Parasitology, vol.
In- vivo antiplasmodial activity of crude n-hexane and ethanolic extracts of Moringa oleifera (Lam.) seeds on Plasmodium berghei. Intl.
Aquaglyceroporin PbAQP during intraerythrocytic development of the malaria parasite Plasmodium berghei. Proc.
Direct microscopic quantification of dynamics of Plasmodium berghei sporozoite transmission from mosquitoes to mice.
Plasmodium berghei ANKA parasites maintained through serial blood passage in mice were used to assess in vivo antimalarial activity of AVELE.
These publications have used mice infected with Plasmodium Berghei (PbA) Antwerpen-Kasapa (ANKA) strain to mimic the human infection with Plasmodium falciparum.
Dr Rita Tewari of the University of Nottingham has completed what she describes as a 'Herculean study', has said that the latest study identifies how protein phosphatases regulate parasite development and differentiation and the research provides a systematic functional analysis for all the 30 phosphatases in Plasmodium berghei, which is the parasite responsible for causing malaria in rodents.
Application of the Method to a Pharmacokinetic Study in Healthy and Plasmodium berghei ANKA Infected Mice.